8800 on tmobile settings and bb maps

I am a newbie with my first blackberry I have a 8800 cingular branded and unlocked. With the help of this site I have downloaded bb maps and removed the vendor codes.
1 I cannot find an icon for bb maps I can find the application in options-advanced-applications but cannot open program

2, I have tmobile internet with hopspots can I use this plan with 8800 if so what are the settings